7. [4] The velocity of an object moving along the x-axis is described by the function v (t) = 312 241' + 36. If s (1) = T and 0 s t s 10 where \"s" is measured in meters and "t\" in seconds. Find the following: a) When the object is at rest. b) When the object is at the origin. c) The acceleration of the object at 1': 3 s. e) The total distance travelled by the object in the rst 10 seconds